Rd Sharma problem

Level 1

There are two numbers $a$ and $b$ ,the smallest prime divisor of $a$ is $3$ and that of $b$ is $7$ .What is the smallest prime divisor of $a+b$ ?This problem is from my class $10^{th}$ RD SHARMA book.

The answer is 2.

1 solution

Gautam Sharma
Apr 9, 2015

See we have that $a$ and $b$ are both odd numbers because it is given that smallest prime divisor of both numbers are odd and only even prime is 2. Now we know $odd+odd=even$

Hence smallest prime divisor is $\boxed2$

Why was this even 10 points? xD xD

Mehul Arora - 6 years, 2 months ago

Rd Sharma problem

The answer is 2.

1 solution

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